Screw driver



y 1, 1936. H. F. PHILLIPS "2,0 6,838

' SCREW DRIVER Filed July 5, 1934 E 4 HENRY E PH/LL/PS 1 INVENTOR.

f BY 49% ATTORNEY Patented July 7, 1936 UNITED STATES PATENT OFFICEassignments, to Phillips Screw Com- D M, Wilmington, DeL, a corporationof Dela Application July 3, 1934, Serial No. 733,622

2 Claims. (Cl. 145-50) This invention relates to improvements in driverparticularly adapted for operative engagement with the type of screwshown and described in my co-pending application filed concurrentlyherewith and entitled Screws, Serial Number 733,623.

The present invention comprises a shank formed at one of its ends with aplurality of dial0 metrically opposed flutes, each of which is made upof flat tapering and converging side walls which originate atequidistant points on the surface of the shank spaced from the endthereof and diverge toward the end of the tool for a portion of theirlength. For the remaining portion of their length they merge into landsor vanes which are formed with flat tapering outer walls having paralleledges substantially throughout their entire length.

The principal object of the invention is the provision of a tool of thischaracter particularly adapted for precise and firm engagement within arecess of corresponding shape punched or otherwise formed in a screwhead. And likewise, the provision of a tool wherein the recessengaginglands or vanes are formed with parallel edges throughout their length.

These and other objects will appear as my invention is more fullyhereinafter described in the following specification. illustrated in theaccompany-ing drawing, and finally pointed out in the appended claims.

In the drawing:

Figure 1 is an enlarged fragmentary view of the lower end of a shankformed into a bit in accordance with my invention.

Figure 2 is a slightly reduced view of the bit turned through 45 degreesfrom the position shown in Figure l.

Figure 3, is a bottom end view of Figure 2.

Figure 4 is a sectional plan view of the bit, taken along the line 4-40! Figure 1.

Referring now more particularly to the drawing:

The invention comprises a shank l, formed at its lower end with aplurality of flutes, generally indicated at 2, which originate frompoints 3, located on the peripheral surface of the shank and which arespaced, as shown, from the lowermost end of the shank. Each flutecomprises two flat side walls 4 and 5, which converge throughout theirlength along a line extending from the points of origin 3 to thelowermost end of the shank. 5

The outer edges of the walls diverge from their points of origin for themajor portion 'of their length to points 6 and I, from whence theyconverge downwardly in parallel edges 8, to a point on the axis of theshank and thus iorm lands, or 10 vanes 9, which are formed with flatoutside walls l0 having parallel outside edges throughout their length.

This particular form of driver, as previously stated, is especiallydesigned for operative en- 15 gagement with the type of screw shown andde-- scribed in my co-pending application, hereinabove referred to. Thevanes 9 and the angular walls therebetween are formed along preciselythe same angular lines as those of the tool-re- 2 ceivlng grooves of therecess shown in the screw.

As a matter of fact, the punch used for producing the recess in thescrew is identical with the driver, herein described, in every respect.

I claim: 35

1. A tool comprising a shank and a bit, said bit comprising a pluralityof diametrically opposed vanes, each of said vanes having a fiat outsidewall with parallel edges, and each of the recesses between said vanescomprising two flat side walls so diverging outwardly from a lineextending from a point of origin on the shank to a point on the end ofthe shank, said parallel edges being formed by the conjunction of saidoutside wall with said recess side walls.

2. A tool comprising a shank and a bit, the end of said bit comprising aplurality of radially disposed screw engaging vanes and flutes, eachvane comprising an outside wall Joining two side walls. the junction ofsaid side walls with said outside wall forming parallel corner edges,the said outside walls of said vanes being inclined toward each otherand toward the end of said bit, and the said side walls of adjacentvanes intersecting along lines inclined downwardly and inwardly frompoints of origin on the shank toward the end of said bit to form saidflutes.

Imimir r. PHILLIPS.

